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Electrochemical hydrogen termination of boron-doped diamond

: Hoffmann, R.; Kriele, A.; Obloh, H.; Hees, J.J.; Wolfer, M.; Smirnov, W.; Yang, N.; Nebel, C.E.


Applied Physics Letters 97 (2010), No.5, Art. 052103, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()

Boron-doped diamond is a promising transducer material for numerous devices which are designed for contact with electrolytes. For optimized electron transfer the surface of diamond needs to be hydrogen terminated. Up to now H-termination of diamond is done by plasma chemical vapor deposition techniques. In this paper, we show that boron-doped diamond can be H-terminated electrochemically by applying negative voltages in acidic solutions. Electrochemical H-termination generates a clean surface with virtually no carbon-oxygen bonds (x-ray photoelectron spectroscopy), a reduced electron affinity (scanning electron microscopy), a highly hydrophobic surface (water contact angle), and a fast electron exchange with Fe(CN)6(-3/-4)(cyclic voltammetry).